Feed water heater



July 28, 1931. Q P. DUGELAY 1,816,518

FEED WATER HEATER Fiied Jan. 31, 1930 I Ev??? 72 7 Patented July 28, 1931 UNITED, STATESTPATENT o 'F cEl;

PAUL DUGELAY, 01? LE nounen'r, FRANCE, ASSIGNOR'TO sooIE'rEraAncAIs'n' DES e romrnsn'r MACHINES WORTHIN'GTON, or PAR-IS, FRANCE, A JOINT-STOCK COM- IP ANY OF FRANCE FEED WATER HEATER Application filed January 31, 1930, Serial- No. 425,017, and in France February 22, 1929.-

The present invention relates to a device for heating the feed water of steam gen: erators, and of locomotives in particular.

The apparatus accordingto the invention, is characterized by the combination with a ,principal heater-condenser including a cold water inlet, a supply of steam under pressure and a warm water outlet, of a plurality of auxiliary condensers, the first of which communicates with the principal condenser from which it receives the excess water and the the first with the same object, and so on, down to the final condenser which returns the excess water to the suction pipe ofthe cold water pump through a suitable duct,

the last and if necessary each of said aux= iliarycondensers having a cold water inlet;

whereby all the steam flowing from one condenser tothe other maybe progressively condensed, so that the last condenser is prac- .1 'tically atatmospheric pressure without an i loss of steam to the outside air. I'

air given off by the warm water can make their way out. Said vents may be independi .denser,the pipe delivering said steam is fitted ent for each condenser, or may establish communication between said condensers at their upper portions, the gas vent of the final condenser being always open to the atmosphere.

a The principal cipal condenser is higher than the exhaust steam pressure of the auxiliary engine which is likewise to be used forheating the water, said exhaust steam may be advantageously,

admitted directly'into one of the auxiliary condensers in which the pressure is lower than that of said exhaust steam. I,

Should it be desiredto continue admitting said exhaust steam into the principal conwith an automatic check valve which closes and certain of the auxiliary condensers may be provided with safety when a predetermined pressure obtains witliinthe principal condenser. 1 7 Other characteristics andpeculiarities o the invention will be apparent from the ensuing description taken in conjunction with the accompanying drawing which shows in sectional elevation a heater of the horizontal type embodying the improvements of the present invention. 1 1 The single figure of the drawing illustrates diagrammatically one embodiment of the invention. a a

The heater illustrated comprises, as usual,

a principal heater condenser 36:into which a a warm water pump 41 through aductil to be discharged into the generator. .The' two driven from a single pumps 33and 41* are steamengine 80.

In accordance with the invention, a number vof auxiliary condensers 50, 51 (two inthe case illustrated) are usedin conjunction with the principal condenser 36. The auxiliary condenser communicates with the prin-.

cipal condenser '36 through an orifice 52 the level'of which determines the upper limiting level of the warm water in the condenser 36.

Similarly, an orifice 53establishes communication between the two auxiliary condensers 50 and 51. To the last, of these condensers is fitted a duct42'through which the 'excesswater is returned to the suction pipe of the cold water pump. I

Cold wateris likewise injectedin each of v the auxiliary condensers 50 and 51. To this end, a sprayer 57 01-58 fed through a cold water by-pass v59, -is mounted in each con.-

denser.

Each of the condensers, both principaland auxiliary, might have a gas vent formed near the top and open to the surrounding air; in

the case illustrated, the water is ridof its gas by causing the condensers to communicate with each other at their upper portions, for example, through orifices 54iand 55, and by 7 phericv pressure approximately.- The mem fitting to the last condenser a gas vent nozzle 56 open to the atmosphere.

The heater described above operates as follows:

I The greater part of the steam admitted to the principal condenser; 36 isv condensed by thec'ol'd water andheats'tlielatter: The noncondensed steam in addition to the excess warm Water enters the first auxiliary con.-

denser through the/orifice 52where there.- is a further condensation of steam. The pressure in said condenser 50 is-consequently much lower than that prevailing in the condenser 36. Thenon-condensed steam and the warm water then pass out from this condenser 50 intoth'ez. auxiliary'condenser 51' in which a final condensation: takes-place,.the

pressure again falling and; reaching atmoshers of the apparatus are so designed. that the whol'eioi thesteanris condensed As said condensation servesexclusively for. heating the? water Whichis. drawn in directly by the Warm water pump or which. is to return to the'zsuotion pipe of the cold water pump, the efficiency of the. apparatus is considerably higher than that of apparatus which; are placed in communication. with; the atmosphere in order toibalanceithepressures.

. Theagasesgilven ofitby' the warm waterzandi which; pass from; one chamber to: another through the orifices; 54r a nd 55, are. finally awithdrawn by thegas release: nozzle 56..

Safety valves and (it are mounted: on the;

- prin cipalicondenser 86 and the.auxi'liary-condenser; 51in. orderhto avoid any accidentalex'r cess, pressures.

' In: order to keep the last; condenser: at ail-1 mospheric pressure, the valvejfilimaybecombined: with. an.- air suction. inlet; valve. In. certain cases, it. might" be" likewise: asdvantae geousto. open the last: condenser to: theate mosphere. In view' of the: successive con 'densat'ions, the loss 01% steami will: be always:

insignificant.

The steam ente ng theprincipal coirdenser 36 will; be pressure steam derived from:

any suitable source; However; the invention concerned in. particular with. the appli.--. cation. to:this heater apparatus of a method ot taking steam, which; consists in; bleeding a certain. quantity of livesteam. from: the zengine cylinder near the end of expansionw-ithinsai'di cylinder.

Ordinary" exhaust. steam, and possibly the exhaust steamof the. auxiliary engines arraving for example through: a du'ct 62; might.

likewise be admitted to the principal condenser'. V .Preferably, anautomaticv check valve 63' will beinsert'ed in said duct 62'. said check valve closing said duct 62 when-the-pressure within-the condenser 36 rises above the pres sureof the exhaust steam ofthe auxiliaryengines, in order'to avoid" v said auxiliary'em gines operating under back pressure. The duct 62 is then made to deliver directly into an auxiliary condenser in which the pressure is always lower than that of the steam of the auxiliary engine. To this end, a bypass tube 65 connected to the tube 62 to the front ofthe' check valve" 63"deliversthe steam directly to the auxiliary condenser 50 through the valve 66.

In certain cases V and asdpre viously described ejectors be usedftohasten the flow- 011-. water andsteam froni one condenser to another. a

It is obvious that ingallrcases; one or more pumps, and in particular the cold water pump could be replaced by an injector or thelikea' 7 Y 1 In a device for heating feed water, the

combination with a principal heater-condenser-including a cold water inlet, asteam inlet and a warm water outlet, of ineans-for delivering cold: water tosaid cOndenser, a

plurality of intercommunicating"auxiliary condensers, the first of'whieh communicates with the principal condenser from which it.

warm water" outlet; I of' a pump for delivering 7 cold water tosaid prineip'al condenser, plurality of inter-communicating auxiliary condensers, the first or which communicates with said principal condenser, means for delivering exhaust'steam at a pressure lower thanthat prevailing 'in said principal'condenser-to the-first of said auxiliary eondensers in which the" pressure is lower' than that of said exhaust steam, and meansior sup-plying cold 'water to each ofsaid auxil: i'ary condensers whereby the steam flowing from one condenser to another-"isprogressively condensed; sothat -the last condenser is practically at atmospheric pressurer without any loss'of steam to the outside air;

3; In a: device for heating feed-watenl the combination with: a principal h'eater eondenser including:v a cold water inlet and a war-mwateroutlet. of a pumpfor delivering cold water to: said principal condenser, a plurality of" inter-communicating auxiliary condensers, the'first of which communicates withsaid-principal co1idenser,means for deliveringexhaust. steam to said! principal" con;

denser, means including an automatic-stop Valve for diverting said exhaust steam to the first of the auxiliary condensers in which the pressure is lower than that of said exhaust steam when the pressure prevailing in said 5 principal condenser is greater than that of said exhaust steam.

PAUL DUGELAY. 

